On improvements of Double Beta Decay using FQTDA Model

37th Brazilian Meeting on Nuclear Physics

de OLIVEIRA, L.^1 ; Samana, A.R.^1 ; Krmpotic, F.^2,3 ; Mariano, A.E.^2,3 ; Barbero, C.A.^2,3

Dep. de Cs. Exatas e Tecnológicas, Universidade Estadual de Santa Cruz, Ilhus, Brazil^1

Departamento de Fsica, Universidad Nacional de la Plata, C. C. 67, La Plata

1900, Argentina^2

Instituto de Física la Plata, CONICET, La Plata

1900, Argentina^3

关键词: Double beta decay;    Intermediary state;    Nuclear matrix elements;    Numerical calculation;    Quasi particles;    Random phase approximations;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/630/1/012048/pdf
DOI  :  10.1088/1742-6596/630/1/012048

来源: IOP

【 摘 要 】

The Quasiparticle Tamm-Dancoff Approximation (QTDA) is applied to describe the nuclear double beta decay with two neutrinos. Several serious inconveniences found in the Quasiparticle Random Phase Approximation (QRPA) are not present in the QTDA, as such as the ambiguity in treating the intermediary states, and further approximations necessary for evaluation of the nuclear matrix elements (NMEs) or, the extreme sensitivity of NME with the ratio between the pn and pp + nn pairings. Some years ago, the decay48Ca →48Ti was discussed within the particle-hole limit of QTDA. We found some mismatch in the numerical calculations when the full QTDA was being implemented, and a new performance in the particle-hole limit of QTDA is required to guarantee the fidelity of the approximation.